CVE-2026-9087

HIGHNVD 8.18.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.3% (24th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 6.4 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-05-20) is not newer than that change (2026-08-03), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week

Also known asEUVD-2026-31134 (ENISA EUVD) · GHSA-m6qj-3mpp-57v8 (GitHub Security Advisories)Source: ENISA EUVD

8.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId, idpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity81% × 45%
Impact severity (EG Severity): CVSS 8.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
24th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.1): severity, escalated by confirmed exploitation. This CVE's 8.1 is its impact severity (EG Severity), not escalated.

EG Severity
8.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-27). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 20, 2026

Last Modified

August 3, 2026

Advisory Details (2)

Auto-updated Jun 10, 2026
Patch available. Sources: redhat.
Red Hat

2480172 – (CVE-2026-9087) CVE-2026-9087 keycloak: Cross-Session Email Verification Proof Not Bound to Upstream Identity in First-Broker-Login

https://bugzilla.redhat.com/show_bug.cgi?id=2480172
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-9087

Vendor Advisories for CVE-2026-9087(5)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhbk/keycloak-rhel92026-06-25redhat
redhatrhbk/keycloak-rhel9-operator:26.4-192026-06-25redhat
redhatrhbk/keycloak-rhel9-operator:26.6-62026-06-10redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
org.keycloak:keycloak-services1.0-alpha-1 ... 9.0.3 (227 versions)
  • every version up to 26.6.3: fixed in 26.6.3
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 42× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 246 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 148 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:36 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  4. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  5. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  6. 2026-10-28 07:15 UTCEG score recompute
  7. 2026-10-28 07:15 UTCVendor advisory
  8. 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  9. 2026-10-26 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  10. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  11. 2026-10-25 13:51 UTCEG score recompute
  12. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  13. 2026-10-23 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  14. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  15. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  16. 2026-10-20 17:50 UTCEG score recompute
  17. 2026-10-20 17:50 UTCVendor advisory
  18. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  19. 2026-10-19 16:34 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  20. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  21. 2026-10-18 03:00 UTCEG score recompute
  22. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  23. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  24. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  25. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.4% · 31st percentile
Show 73 more
  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  2. 2026-10-13 04:44 UTCEG score recompute
  3. 2026-10-13 04:44 UTCVendor advisory
  4. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  5. 2026-10-12 14:46 UTCEG score recompute
  6. 2026-10-11 19:14 UTCEG score recompute
  7. 2026-10-11 16:30 UTCEG score recompute
  8. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  9. 2026-10-11 13:45 UTCEG score recompute
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  11. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  12. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  14. 2026-10-06 15:19 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  15. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  16. 2026-10-04 23:23 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  18. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  19. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  20. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  21. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  22. 2026-09-27 13:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  23. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  24. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  25. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  26. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  27. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  28. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  29. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  30. 2026-09-17 19:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  31. 2026-09-16 14:09 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  32. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  33. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  34. 2026-09-13 16:48 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  35. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  36. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  37. 2026-09-11 09:38 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  38. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  39. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  40. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  41. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  42. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  43. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  44. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  45. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  46. 2026-08-30 19:18 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  47. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  48. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  49. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  50. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  51. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  52. 2026-08-24 14:18 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  53. 2026-08-23 16:53 UTCEG score recompute
  54. 2026-08-23 16:53 UTCVendor advisory
  55. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  56. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  57. 2026-08-21 22:53 UTCEG score recompute
  58. 2026-08-21 22:53 UTCVendor advisory
  59. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  60. 2026-08-20 18:54 UTCEG score recompute
  61. 2026-08-20 18:54 UTCVendor advisory
  62. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  63. 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  64. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  65. 2026-08-17 09:52 UTCVendor advisory
  66. 2026-08-16 16:54 UTCEG score recompute
  67. 2026-08-16 16:54 UTCVendor advisory
  68. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  69. 2026-08-16 03:29 UTCEG score recompute
  70. 2026-08-16 03:29 UTCVendor advisory
  71. 2026-08-16 02:15 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  72. 2026-08-15 01:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  73. 2026-08-15 00:43 UTCVendor advisory

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-9087?
CVE-2026-9087 is a high-severity vulnerability; its CVE record was published on May 20, 2026. A flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId, idpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account.
When was CVE-2026-9087 made public?
CVE-2026-9087 was made public on May 20, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on May 20, 2026. EchelonGraph's copy of the record carries a last-modified date of August 3, 2026; the record at its source may have been updated since.
Is CVE-2026-9087 actively exploited?
CVE-2026-9087 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (24th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-9087?
CVE-2026-9087 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-9087?
A fix for CVE-2026-9087 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-9087 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-9087

Explore →

Is Your Infrastructure Affected by CVE-2026-9087?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs